feat(bookings): show transport routes on map (#384, #587)

Adds from/to endpoints to flight/train/cruise/car reservations with
live map rendering. Flights use geodesic arcs and a curved duration +
distance badge; train/car/cruise render as straight or geodesic lines
with endpoint markers. Airports come from an embedded OurAirports
database (~3200 airports, offline-capable); train/cruise/car locations
via Nominatim. Per-trip connection toggle sits in the day plan
sidebar, persisted in localStorage. Clicking a map endpoint opens the
existing transport detail popup. New display setting toggles endpoint
labels on the map. Migration 105 adds the reservation_endpoints table
plus needs_review flag; existing flights are backfilled from their
IATA metadata on server startup.

server/scripts/build-airports.mjs

@@ -0,0 +1,108 @@
+#!/usr/bin/env node
+// Build server/data/airports.json from OurAirports (davidmegginson.github.io/ourairports-data).
+// License: Public Domain. Keeps large/medium airports with an IATA code; timezone derived from coords via tz-lookup.
+
+import fs from 'node:fs'
+import path from 'node:path'
+import https from 'node:https'
+import { fileURLToPath } from 'node:url'
+import tzLookup from 'tz-lookup'
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
+const OUT = path.join(__dirname, '..', 'data', 'airports.json')
+const SRC = 'https://davidmegginson.github.io/ourairports-data/airports.csv'
+
+function fetchText(url) {
+  return new Promise((resolve, reject) => {
+    https.get(url, (res) => {
+      if (res.statusCode !== 200) return reject(new Error(`HTTP ${res.statusCode}`))
+      let data = ''
+      res.setEncoding('utf8')
+      res.on('data', chunk => { data += chunk })
+      res.on('end', () => resolve(data))
+    }).on('error', reject)
+  })
+}
+
+function parseCsv(text) {
+  const rows = []
+  let row = []
+  let cur = ''
+  let inQuotes = false
+  for (let i = 0; i < text.length; i++) {
+    const ch = text[i]
+    if (inQuotes) {
+      if (ch === '"') {
+        if (text[i + 1] === '"') { cur += '"'; i++ } else { inQuotes = false }
+      } else {
+        cur += ch
+      }
+    } else {
+      if (ch === '"') inQuotes = true
+      else if (ch === ',') { row.push(cur); cur = '' }
+      else if (ch === '\n') { row.push(cur); rows.push(row); row = []; cur = '' }
+      else if (ch === '\r') { /* skip */ }
+      else cur += ch
+    }
+  }
+  if (cur.length > 0 || row.length > 0) { row.push(cur); rows.push(row) }
+  return rows
+}
+
+const raw = await fetchText(SRC)
+const rows = parseCsv(raw)
+const header = rows[0]
+const idx = (name) => header.indexOf(name)
+const TYPE = idx('type')
+const NAME = idx('name')
+const LAT = idx('latitude_deg')
+const LNG = idx('longitude_deg')
+const COUNTRY = idx('iso_country')
+const MUNICIPALITY = idx('municipality')
+const SERVICE = idx('scheduled_service')
+const ICAO = idx('icao_code')
+const IATA = idx('iata_code')
+
+const KEEP = new Set(['large_airport', 'medium_airport'])
+const airports = []
+let skippedNoTz = 0
+
+for (let i = 1; i < rows.length; i++) {
+  const r = rows[i]
+  if (!r || r.length < header.length) continue
+  if (!KEEP.has(r[TYPE])) continue
+  const iata = r[IATA]?.trim().toUpperCase()
+  if (!iata || iata.length !== 3) continue
+  if (r[SERVICE] !== 'yes') continue
+  const lat = Number(r[LAT])
+  const lng = Number(r[LNG])
+  if (!Number.isFinite(lat) || !Number.isFinite(lng)) continue
+
+  let tz = null
+  try { tz = tzLookup(lat, lng) } catch { skippedNoTz++; continue }
+  if (!tz) { skippedNoTz++; continue }
+
+  airports.push({
+    iata,
+    icao: r[ICAO]?.trim().toUpperCase() || null,
+    name: r[NAME],
+    city: r[MUNICIPALITY] || '',
+    country: r[COUNTRY] || '',
+    lat: Math.round(lat * 1e6) / 1e6,
+    lng: Math.round(lng * 1e6) / 1e6,
+    tz,
+  })
+}
+
+const seen = new Map()
+for (const a of airports) {
+  const existing = seen.get(a.iata)
+  if (!existing) { seen.set(a.iata, a); continue }
+  if (existing.icao && !a.icao) continue
+  if (!existing.icao && a.icao) seen.set(a.iata, a)
+}
+const unique = Array.from(seen.values()).sort((a, b) => a.iata.localeCompare(b.iata))
+
+fs.writeFileSync(OUT, JSON.stringify(unique))
+const size = fs.statSync(OUT).size
+console.log(`Wrote ${unique.length} airports to ${OUT} (${(size / 1024).toFixed(1)} KB); skipped ${skippedNoTz} without timezone`)